CODEWITHSUNDEEP
phparraysformat
cleverketchup
cleverketchup

Reputation: 340

Reformat array without temp variable

I have the next array

[
    ['id' => 30, 'count' => 3],
    ['id' => 45, 'count' => 7]
]

I need it to be

[
    30 => ['count' => 3],
    45 => ['count' => 7]
]

What I did

$formatted = [];
foreach ($services as $service) {
    $formatted[$service['id']] = [
        'count' => $service['count']
    ];
}

What I'd like is a more elegant solution without the temporary $formatted variable. Thanks!

Update. Thanks a lot @rtrigoso ! With the laravel collection, my code looks next

$services->reduce(function ($carry, $item) {
        $carry[$item['id']] = ['count' => $item['count']];
        return $carry;
    });

Upvotes: 0

Views: 50

Answers (2)

iainn
iainn

Reputation: 17417

You can do this in one line with array_column:

$array = array_column($array, null, 'id');

The one difference between your desired output is that this will still contain the id key in the second level of the array, like so:

[
    30 => ['id' => 30, 'count' => 3],
    45 => ['id' => 45, 'count' => 7],
]

but that hopefully shouldn't cause any problems. If you do need to remove it, you can do it with something like:

$array = array_map(function ($e) {
    unset($e['id']);
    return $e;
}, $array);

This approach is probably best if your rows could potentially have a lot more keys in them in future, i.e. it's quicker to list the keys to remove rather than the ones to keep. If not, and you'll only have a count, then to be honest your original example is probably the best you'll get.

Upvotes: 5

ren.rocks
ren.rocks

Reputation: 792

You can use array_reduce

$x_arr = array(
    array('id' => 30, 'count' => 3),
    array('id' => 45, 'count' => 7),
);

$y_arr = array_reduce($x_arr, function ($result, $item) {
    $result[$item['id']] = array('count' => $item['count']);
    return $result;
}, array());

print_r($y_arr);

It will give you your desired result:

Array
(
    [30] => Array
    (
        [count] => 3
    )

    [45] => Array
    (
        [count] => 7
    )
)

Upvotes: 2

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